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检索条件"任意字段=4th IEEE Sensor Array and Multichannel Signal Processing Workshop"

共 931 条记录，以下是61-70 订阅

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Ultrasonic array Imaging for Immersion Non-Destructive Testing

Ultrasonic Array Imaging for Immersion Non-Destructive Testi...

引用

8th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Moallemi, Nasim Shahbazpanahi, Shahram Univ Ontario Inst Technol Fac Engn & Appl Sci Oshawa ON Canada

ISBN: (纸本)9781479914814

One of the applications of advanced array signal processing is immersion ultrasonic non-destructive testing (NDT), where a solid test sample and an array of transducers are immersed in water, for the purpose of imaging the test sample. To do so, the knowledge of the shape of the upper surface of the test sample is needed. We model the interface between water and the solid as an incoherently spatially distributed reflector. We then develop a covariance fitting based approach to estimate the parameters of the shape of the upper surface of the test sample. With the knowledge of the estimated shape of this surface, we use the same approach to estimate the parameters of the shape of a crack inside the test sample. Numerical simulations are conducted to show the accuracy of the proposed approach.

关键词： test sample ultrasonic arrays Nondestructive Testing array signal processing Transducers

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Moving target detection of array antennas based on time reversal 11

Moving target detection of array antennas based on time reve...

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ieee 11th sensor array and multichannel signal processing workshop (SAM)

作者： Zhang, Zhaoming Chen, Baixiao Yang, Minglei Xu, Hui Xidian Univ Natl Lab Radar Signal Proc Xian Peoples R China Xidian Univ Sch Elect Engn Xian Peoples R China

ISBN: (纸本)9781728119465

this paper develops a time reversal moving target detector based on array antennas. Time reversal utilizes the multipath effect by retransmitting the received signal containing the Doppler shift of the moving target. Two detectors are derived in both conventional and time reversal scenarios, respectively. the Monte Carlo results show that the time reversal detector significantly improves the target detection probability in multipath environments compared with the conventional detector. the increase of multipath number is helpful to improve the detection probability of time reversal detector.

关键词： time reversal moving target array antennas detection

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Incorporating array Nonidealities Into Adaptive Capon Beamformer for Source Tracking

Incorporating Array Nonidealities Into Adaptive Capon Beamfo...

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ieee 7th sensor array and multichannel signal processing workshop (SAM)

作者： Costa, Mario Koivunen, Visa Aalto Univ Dept Signal Proc & Acoust SMARAD CoE FI-00076 Aalto Finland

ISBN: (纸本)9781467310710

An adaptive algorithm for azimuth-angle estimation of moving sources in the presence of array nonidealities is proposed. the method, termed unitary element-space Capon (UES-Capon) beamformer, is robust in the face of small number of snapshots and fully takes into account effects such as mutual coupling, mounting platform reflections, and sensor's misplacement errors. Unlike most of the robust beamformers available in the literature, the proposed method is based on QR-decomposition and real-valued polynomial root tracking. Furthermore, it is applicable to sensor arrays of arbitrary configuration. Numerical results using a real-world antenna array are included, illustrating the excellent performance of the proposed method, both in terms of SINR and fast adaptivity to moving sources.

关键词： capon sensor arrays Snapshots SINR Self tuning tracking

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GENERALIZED COPRIME array CONFIGURATIONS

GENERALIZED COPRIME ARRAY CONFIGURATIONS

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8th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Qin, Si Zhang, Yimin D. Amin, Moeness G. Villanova Univ Ctr Adv Commun Villanova PA 19085 USA

ISBN: (纸本)9781479914814

A coprime array consists of two uniform linear subarrays that construct an effective difference co-array with certain desirable characteristics. In this paper, we propose a generalized coprime array concept through the compression of the interelement spacing of one constituting subarray. As such, the existing variations of coprime array and nested array structures are represented as special cases. the achievable unique lags as well as consecutive lags in the resulting virtual array are analytically expressed, and the direction-of-arrival estimation performance is examined using both the MUSIC algorithm and sparse signal reconstruction techniques.

关键词： Coprime array sparse array difference co-array direction-of-arrival estimation compressive sensing

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Passive Angle-Doppler Profile Estimation for Narrowband Digitally Modulated Wireless signals 12

Passive Angle-Doppler Profile Estimation for Narrowband Digi...

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ieee 12th sensor array and multichannel signal processing workshop (SAM)

作者： Argyriou, Antonios Univ Thessaly Dept Elect & Comp Engn Volos Greece

ISBN: (纸本)9781665406338

In this paper, we improve estimation of the Doppler shift present in signals that originate from multiple wireless digital communication transmitters. We deploy a uniform linear array (ULA) that overhears the frequency band of interest, hence an unauthorized wireless receiver (URx), and propose an algorithm for extracting the symbol duration from the unknown modulated data. the baseband wireless modulated signal is stripped from its data-induced phase shifts, allowing us to calculate high quality estimates of the periodogram, the spectrogram, and the angle-Doppler profile. Performance results show that high quality results without artifacts from digital modulation can be obtained.

关键词： Wireless communication Wireless sensor networks Transmitters Digital modulation Estimation Symbols signal processing algorithms

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Computation of Weight Function of 2qth Order Virtual array to Analyse the Estimation Performance 11

Computation of Weight Function of 2qth Order Virtual Array t...

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ieee 11th sensor array and multichannel signal processing workshop (SAM)

作者： Gupta, Payal Agrawal, Monika Indian Inst Technol Ctr Appl Res Elect New Delhi 110016 India

ISBN: (纸本)9781728119465

Increasing the number of sources to be processed from a given array of sensors is an important problem in sensor array signal processing and of interest to many researchers. this problem has also been tackled with the virtual array based approach where the covariance and cumulant lags provide a virtual sensor. Here, an important parameter which affects the parameter estimation accuracy and latency is weight function. the weight function is defined as the frequency of occurrence of each virtual sensor in the virtual array. We provide the close-form expression of virtual array corresponding to linear array. We have also analytically evaluated the weight function of virtual array and have also studied the effect of the weight function on parameter estimation. Simulation results show the parameter estimation accuracy is significantly improve with high weight function.

关键词： DoA estimation Non-circular signals Sparse array Virtual array Cumulants Underdetermined System Weight function Covariance Matrix

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COMPRESSIVE SENSING IN NONSTATIONARY array processing USING BILINEAR TRANSFORMS

COMPRESSIVE SENSING IN NONSTATIONARY ARRAY PROCESSING USING ...

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ieee 7th sensor array and multichannel signal processing workshop (SAM)

作者： Zhang, Yimin D. Amin, Moeness G. Villanova Univ Ctr Adv Commun Villanova PA 19085 USA

ISBN: (纸本)9781467310710

Compressive sensing (CS) has successfully been applied to reconstruct sparse signals and images from few observations. For multi-component nonstationary signals characterized by instantaneous frequency laws, the sparsity exhibits itself in the time-frequency domain as well as the ambiguity domain. In this paper, we examine CS in the context of nonstationary array processing. We show that the spatial averaging of the ambiguity function across the array improves the CS performance by reducing both noise and cross-terms. the corresponding time-frequency distribution which is reconstructed through L-1 minimizations yields significant improvement in time-frequency signature localizations and characterizations.

关键词： array processing Compressed sensing ambiguity function bilinearity Transform

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Precoding for RadComm Systems Based on Hybrid Antenna arrays 11

Precoding for RadComm Systems Based on Hybrid Antenna Arrays

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ieee 11th sensor array and multichannel signal processing workshop (SAM)

作者： Feng, Freddy Y. P. Huang, Lei Shenzhen Univ Sch Informat Engn Shenzhen Peoples R China

ISBN: (纸本)9781728119465

Integrated wireless communications and radar detections have so far mainly relied on phased-array (PA) antennas with only considering the beampatterns in angle domain. By applying the frequency diverse array (FDA) into radar and communications (RadComm) systems, a compact dual-functional structure of joint PA and FDA is designed. Based on the built joint PA and FDA channel models, different beamformer designs are proposed by jointly optimizing the signal-to-interference-noises of the communications and radar. Numerical simulations demonstrate the performances of both communications and the radar with the proposed approaches are over than that of the conventional PA RadComm systems.

关键词： RadComm frequency divers array joint PA and FDA

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Model for a smart network monitoring a wired sensor matrix

Model for a smart network monitoring a wired sensor matrix

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4th ieee sensor array and multichannel signal processing workshop

作者： Magagni, Luca Gennaretti, Davide Nicolini, Matteo Sergio, Maximilian Guerrieri, Roberto Canegallo, Roberto Univ Bologna ARCES I-40126 Bologna Italy STMicroelect FTM Agrate Brianza Italy

ISBN: (纸本)1424403081

Monitoring harsh environments such as underwater scenarios or aircraft external surfaces pertains to important applications like assisted navigation and tactical surveillance;nevertheless, it poses additional challenges compared with standard applications. At Transducers2005 we presented a wired addressing architecture of distributed sensors for monitoring real-time in-situ pressure variations in underwater environment that faces the above-mentioned issues. this architecture consists in a double array of identical and interconnected smart nodes monitoring a matrix of passive sensors. I n this paper, we present an analysis of the delay model related to the presented architecture and a calculation of the overall frame-rate of the system as a function of the geometrical topology of the arrays. the topology of the network, i.e. the length of each bus and the number of nodes, can be chosen according to the application, and directly affects the global capacitive load on the serial lines. Each serial line can be schematized with a distributed RC model for the flat cable plus a lumped capacitance for each smart node. then, a 3(rd)-order pi-segmented model of O'Brien-Savarino [4] is calculated for a 16-block fine with block length equal to 0.3m. thanks to that, the global time per iteration is calculated on each bus as well as the scanning time of the whole matrix and the frame rate for the system as a function of sensor distribution and of the aspect ratio of the matrix. this model can be employed to identify the optimal arrangement for the sensor matrix and smart node arrays.

关键词： Intelligent networks

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QoE-aware UAV flight path design for mobile video streaming in HetNet 10

QoE-aware UAV flight path design for mobile video streaming ...

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10th ieee sensor array and multichannel signal processing workshop (SAM)

作者： Colonnese, Stefania Carlesimo, Andrea Brigato, Lorenzo Cuomo, Francesca Sapienza Univ Rome Rome Italy

ISBN: (纸本)9781538647523

In this paper, we address the problem of devising a Quality of Experience (QoE) aware flight plan for UAV mounted Base Station within heterogeneous networks. Specifically, we propose a QoE aware flight planning algorithm leveraging the well established Q-learning approach and introducing a reward related to relevant QoE metrics. Numerical simulation results show the effectiveness of the QoE-aware learning algorithm to devise a flight path such that the UAVs mounted Base Station actually improves the QoE of the heterogeneous network users.

关键词： Quality of experience Streaming media signal processing algorithms Delays Bandwidth Path planning Unmanned aerial vehicles"

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